Schott Ag

Ppg Industries, Inc.

Ppg Industries Ohio, Inc.

Amarendra Mishra

Larry J Shelestak

George B Goodwin

James M Baldauff

James Victor Jones

George A Pecoraro

An aircraft transparency in a glass piece, wherein the glass piece includes a chemically tempered first major surface and a chemically tempered opposite second major surface, a first case depth begins at the first major surface, a second case depth begins at the second major surface, and a tensile stress zone is within the glass piece between the end points of the first and the second case depths. The glass between the end points of the first and second case depth has a glass composition including: the glass has at least one of the following properties (a) a log 10 viscosity temperature of at least 1413&#xb0; F. and (b) a liquidus temperature of at least 2436&#xb0; F.

Aircraft transparency having chemically tempered lithia-alumina-silica containing glass and method of making the chemically tempered glass

A glass composition for chemical tempering includes oxides in wt % ranges of: SiO60 to 75; AlO18 to 28; LiO 3 to 9; NaO 0 to 3; KO 0 to 0.5; CaO 0 to 3; MgO 0 to 3; ZrO0 to 3; where MgO+CaO is 0 to 6 wt %; AlO+ZrOis 18 to 28 wt %, and NaO+KO is 0.05 to 3.00 wt %. The glass has a log 10 viscosity temperature in the temperature range of 1328&#xb0; F. (720&#xb0; C.) to 1499&#xb0; F. (815&#xb0; C.); a liquidus temperature in the temperature range of 2437&#xb0; F. (1336&#xb0; C.) to 2575&#xb0; F. (1413&#xb0; C.), and a log 7.6 softening point temperature in the temperature range of 1544&#xb0; F. (840&#xb0; C.) to 1724&#xb0; F. (940&#xb0; C.). The chemically tempered glass has, among other properties, an abraded modulus of rupture of 72 to 78 KPSI, and a modulus of rupture of 76 to 112 KPSI.

Lithia-alumina-silica containing glass compositions and glasses suitable for chemical tempering and articles made using the chemically tempered glass

Material selected from the group consisting essentially of molybdenum, arsenic, antimony, bismuth, copper, silver, potassium dichromate and iron chromite, is added during the manufacture of soda-lime-silica float glass to reduce the occurrences of nickel sulfide stone defects. Material is added in sufficient amounts such that the resulting glass is at least 0.010 wt. % selected material. In a preferred embodiment of the invention, molybdenum is added in the form of sodium molybdate such that the resulting glass is at least 0.015 wt. % molybdenum.

Reduction of nickel sulfide stones in a glass melting operation

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Allison Park, PA, United States of America

Amarendra Mishra